﻿#region Copyright
// Copyright (c) 2011-2012 RaisingForce Team (Alikin Sergey)
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.Diagnostics.Contracts;
using RaisingForce.Raise.Language.Rules;

namespace RaisingForce.Raise.Language.RStates.Internal
{
    public abstract class ChainContainerState :
        RState,
        IEquatable<ChainContainerState>
    {
        #region Constructors

        protected ChainContainerState(string name)
            : base()
        {
            Contract.Requires(ChainRules.NameIsValid(name));
            this.name = name;
        }

        #endregion

        #region Private Declarations

        private readonly string name;

        [ContractInvariantMethod]
        private void ObjectInvariant()
        {
            Contract.Invariant(ChainRules.NameIsValid(this.name));
        }

        #endregion

        #region Properties

        public string Name
        {
            get
            {
                Contract.Ensures(ChainRules.NameIsValid(Contract.Result<string>()));
                return this.name;
            }
        }

        #endregion

        #region Base Overrides

        public override bool Equals(object obj)
        {
            return obj is ChainContainerState ?
                this.Equals((ChainContainerState)obj) :
                false;
        }

        public override int GetHashCode()
        {
            return this.name.GetHashCode();
        }

        protected override bool equals(RState other)
        {
            return other is ChainContainerState ?
                this.Equals((ChainContainerState)other) :
                false;
        }

        #endregion

        #region IEquatable<ChainContainerState> Members

        [Pure]
        public bool Equals(ChainContainerState other)
        {
            return other != null ?
                this.name == other.name
                && this.GetType() == other.GetType() :
                false;
        }

        #endregion
    }
}
